 Users of scholarly communication services must be authorized to access them securely and seamlessly among various infrastructures and providers. OpenAir AAI is a service that allows users to access the OpenAir services in EOSC with one account. AAI stands for Authentication and Authorization Infrastructure. OpenAir AAI is available for free and is accessible via a simple login form. What about users that need to add authorization functionalities to their services? This is available only on demand and under specific criteria. How can one use the AAI service? Simple. When requesting to access a service, a user-friendly window appears. Users can select to sign in via their OpenAir account, an institutional account, GitHub, Orkid, a social media account. AAI helps you experience interoperability along open science infrastructures and services. Securely access and use EOSC services and resources. Retain ownership of your work among different providers. Minimize time spent dealing with credentials frustrations. Maintain your roles and access rights with one account. AAI is a service for researchers, content providers, research performing organizations, research infrastructures, funders and policymakers, innovators, public actors. OpenAir AAI is trusted by thousands of users for its quality, security and compliance with standards in GDPR. Easily access OpenScience. Log in now.